Motor upgrade for lathe

First off, sorry about my ignorance.

I’ve been doing a lot of research on lathe mods. One thing that I would like to do is upgrade the motor on my lathe. I see that a lot of people online have mentioned using dc motors and pwm’s from treadmills. I concidered this method for a while, but I think I want to go with the 3ph 2-3hp 220 vac motor and variable frequency drive. I have spent a lot of time searching for a motor and vfd online and have run into a few questions.

1. Most vfd’s advertised say the max hp for the motor that they can run. I am guessing that is the max amps the vfd puts out?
2. If your got a 3hp vfd, I assume you could use say a 2hp motor with it?
3. The output freq for the vfd is a range. I have seen some say 0-60, 0-400, or one that said 5-68. I may be a little off on the numbers. Am I correct in the assumption that the hertz is what determines the rpm on the motor? If so, then a vfd that puts our 0-60hz would have an rpm range from 0-X rpm?
4. Most vfd I have seen have a forward and reverse option. Does this require a certain type of ac motor for both directions?
5. I have read that some motors require a capacitor start. Is that something that a vfd is able to do?

I have many more questions, but I’ll leave it at these for now. It seems the more I read, the more questions come up.

If anyone has done an upgrade like this, please let me know what would be a good motor/vfd would be and a possible source. A lot of people talk about ebay and this online surplus store

Any information would be greatly appreciated.

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